package sy4_2;

public class demo {
    public static void main(String[] args) {
        computer computer=new computer();
        computer.close();
        computer.open();
        Keybord keybord=new Keybord();
        keybord.beat();
        keybord.open();
        keybord.close();
        Mouse mouse=new Mouse();
        mouse.click();
        mouse.open();
        mouse.close();
    }
}
